"I think it worked out that I'm going to do four episodes," Janney told Zap2it. "I'm really excited to come back to that. I have no idea what they're going to do with Margaret Scully, but I can't wait to find out."
Janney says that previously, it worked out that she was filming the two shows separately, but this time around, it looks like she'll be pulling double duty.
"It might turn out that I'll have to be doing ['Masters of Sex'] at the same time when I go back for Season 3 of 'Mom.' It'll be my hiatus week, which will be interesting," says Janney. "I didn't have to do it at the same time before, it worked out that I could do them both separately. But fortunately the characters are so different and the time period is so different that I think it's easy for me [to go back and forth]."